CPC · California Plumbing Code

When are terms from other California codes used?

If a plumbing plan uses a word that the CPC Chapter 2 does not define, the CPC process is to take the meaning from the California code that does define it (for example the California Building Code or Existing Building Code); if a conflict between codes appears, CPC’s Chapter 1 supplies order‑of‑precedence rules. Check Chapter 2 first, then the other California code, and confirm any agency‑specific exceptions.

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Last reviewed: July 6, 2026

What the code requires — plain English (controlling §)

  • Under § 201.1 the code limits the scope and says Chapter 2 supplies the meanings of words used in the code; Chapter 2 is the starting place for definitions. See the CPC Chapter‑2 introduction for that structure.
  • When a term is not defined in this code, the usual California approach is to adopt the definition given in the other California codes — i.e., use the definition from the other Title 24/California code where that term is defined. That cross‑reference rule appears throughout the California code family (see the California Building/Existing Building Code language reproducing the cross‑reference rule).

The single most important rule: If a word is not defined in the CPC Chapter 2, use the meaning assigned to that word in the other California code where it is defined (unless a specific CPC provision says otherwise).

Requirements in detail

What “look here first” means

  • Primary source: CPC Chapter 2 (Definitions) — start here. Chapter 2 exists to supply the code’s definitions and to keep terminology consistent; Chapter 2 guidance is stated in the CPC text.
  • If the term is not in CPC Chapter 2: the cross‑reference rule in California practice directs you to the other California code that defines the term (for example the California Building Code, California Fire Code, California Mechanical Code, California Residential Code, etc.). The Building/Existing Building Code text gives the explicit wording of that rule.

Which “other code” applies

  • The applicable other California code is the one that actually contains a definition for the term (e.g., a term used in plumbing that’s defined in the California Building Code or the California Existing Building Code). The codes name each other as the sources for undefined terms.

What to do when definitions conflict

  • Order of precedence: the CPC includes an administrative order‑of‑precedence rule in Chapter 1 — where a specific provision of this code conflicts with a referenced standard, the text of the California building standard governs; where different parts of Title 24 conflict, the most restrictive requirement normally applies. See CPC Chapter 1 language on order of precedence and conflicts.

Decision table — which definition controls

Decision dimension If… Result (which definition controls) Code reference
Is the term defined in CPC Chapter 2? Yes Use the CPC Chapter 2 definition CPC Chapter 2 (definitions)
Is the term absent from CPC Chapter 2 but defined in another California code? Yes Use the definition in that other California code (e.g., CBC, CFC, CRC, CMC) See the cross‑reference rule as used across California codes — e.g., §201.3 language in CA codes
Term not found in CPC Chapter 2 or other California codes Yes Use ordinarily accepted meanings (common‑usage/dictionary) as context implies CPC Chapter 2 guidance (terms not defined have ordinarily accepted meanings)
Definitions conflict between parts of Title 24 Yes Apply order‑of‑precedence / most‑restrictive rule per Chapter 1 (see CPC §1.1.7.x) CPC Chapter 1 (order of precedence)

Exceptions & special cases

  • Agency‑specific definitions: some agencies (e.g., DSA, OSHPD) have unique rules. Where a special agency (DSA, OSHPD, OSHPD 1/1R/2/4/5) has adopted its own definitional authority or references (for example, Chapters 6 & 7 of the California Administrative Code or specified sections of the California Administrative Code), those agency definitions may govern instead of the generic § 202 definitions. The Existing Building Code notes these agency exceptions explicitly; treat agency‑specific notes as controlling for that agency’s projects.
  • Nonbuilding standards and referenced standards: the CPC distinguishes building standards from nonbuilding standards or referenced standards adopted by reference; nonbuilding standards may not become part of the enforceable Title 24 text — check CPC Chapter 1 (referenced codes / nonbuilding standards) before treating a nonbuilding standard’s terminology as authoritative.

Common mistakes

  • Mistake: assuming every term used in the UPC/IAPMO text is the CPC definition. Reality: the CPC is Title 24; if CPC defines a term, that definition controls. If it doesn’t, use the California code that does — do not default to the UPC/ANSI/industry standard without checking CPC Chapter 1/Chapter 2.
  • Mistake: failing to check agency adoption/amendment matrices. Some sections are not adopted by all agencies or are adopted with California amendments — always confirm whether your adopting agency has altered definitions. The CPC contains matrix/adoption information and agency notes in its front matter.
  • Mistake: treating a commonly used industry term as “defined” when it is only used informally in plans. Always check Chapter 2 and the other California codes before assigning a regulatory meaning.

Worked example — concrete scenario applying the rule (step‑by‑step, with numbers)

Scenario: A plumbing plan for a small property labels one room “ADU” (Accessory Dwelling Unit). The reviewer must decide whether that label triggers additional plumbing requirements.

  1. Check CPC Chapter 2 for Accessory Dwelling Unit. If CPC Chapter 2 does not define the term, proceed to step 2. (Start point: CPC Chapter 2 is the definitions chapter.)
  2. The cross‑reference rule says: if the term is not in CPC, use the California code that defines it. Search the other California codes — the Existing Building Code / Building Code include an ACCESSORY DWELLING UNIT definition in Section 202 and mark its agency references (HCD 1 & HCD 2). That definition requires independent living facilities including sanitation.
  3. Apply the definition to plumbing: because the other code defines ADU as a dwelling with permanent sanitation, treat the labeled room as an ADU for CPC plumbing purposes. Practically, that means: the project has 1 ADU unit. If your jurisdiction’s plumbing rules require one set of dwelling‑unit plumbing fixtures per dwelling, you must provide that one set for the ADU (1 ADU → 1 additional set of dwelling fixtures). (Process shown here is the definitional decision — specific fixture counts are determined from CPC fixture tables once you have identified the occupancy type.)

Numbers in this worked example are operational (1 ADU → 1 dwelling unit worth of fixtures). For the specific number and type of fixtures required, consult the CPC fixture table (e.g., Table 422.1) and the adopted local amendments.

Related provisions (quick references)

  • § 201.1 — Scope; Chapter 2 is the definitions source (see CPC Chapter‑2 commentary).
  • § 202.0 / Chapter 2 (Definitions) — general definitions and the “terms not defined have ordinarily accepted meanings” guidance.
  • § 1.1.6 — Nonbuilding standards, orders, and regulations; how referenced documents are treated.
  • § 1.1.7.3 — Order of precedence / conflicts (most restrictive rule across Title 24 parts).
  • CPC tables and fixture rules used after definitions are chosen (example: Table 422.1 — plumbing fixture counts).

(If you need the exact, verbatim § 201.3 language as it appears in the CPC Chapter 2, I could pull the Chapter 2 pages from the CPC PDF you have and quote the exact text; the uploaded CPC files include Chapter‑2 commentary but the specific numbered text for § 201.3 in the CPC Chapter 2 was not plainly visible in the snippets I retrieved — the same rule, however, is explicitly shown in the California Building and Existing Building Code texts I cited above.)

Code references

Grounded in the retrieved California Plumbing Code — click a citation to read the verbatim passage:

  • CPC § 101.2.2 Medium relevance — show source text

    CFC—25: California Fire Code

    101.2.2, 101.4.2, 301.3.1, 302.2, 307.1, 308.1, 802.2.1, 802.2.3, 803.2.3, 803.4.1.1, 803.4.1.2, 803.4.1.3, 803.4.1.4, 803.4.1.5, 803.4.1.6, Table 804.5.1.1(1), 904.1.5, 1011.6.1.1, 1303.1.2, 1305.2.8.1, 1305.2.14, 1305.2.14.1, 1401.2, 1501.1, 1501.5, 1502.1, 1502.1.1, 1502.2, 1502.3, 1504.1, 1507.1, 1507.2

    CMC—25: California Mechanical Code

    302.2, 702.7, 807.1, 902.1.1, 1008.1, 1305.2.7.1, 1305.2.8, 1305.2.8.1

    CPC—25: California Plumbing Code

    302.2, 408.1, 702.7, 1009.1, 1009.2, 1009.3, 1009.5, 1302.1.6, 1503.1

    16-4 2025 CALIFORNIA EXISTING BUILDING CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    REFERENCED STANDARDS

    CRC—25: California Residential Code

    101.2, 101.4.1, 104.3.1, 109.3.3, 109.3.10, 302.2, 307.1, 308.1, 401.3, 402.1, 405.2.6, 502.2, 502.3, 502.4, 503.2, 503.3, 503.11, 505.2, 505.3, 507.3, 701.3, 702.4, 702.5, 706.2, 708.1, 805.2, 806.4, 809.1, 906.2, 907.1, 1011.2.1, 1103.1, 1103.2, 1103.3, 1104.1, 1201.4, 1302.1.2, 1302.1.3, 1302.1.3, 1303.1.3, 1401.2, 1402.1, 1402.2, 1402.2.1, 1402.3, 1402.4, 1402.5, 1402.6

    ICC 300—2023: ICC Standard on Bleachers, Folding and Telescopic Seating and Grandstands

    301.1.1, 401.1.1, 1401.1.1

    ICC A117.1—2017: Accessible and Usable Buildings and Facilities

  • CPC § 11.0 Medium relevance — show source text

    11.0 - 1.11.11_|||X|||||||||||||||||||||| |1.13.0||||||||||||||||||||X||||| |Division II - Scope and
    Administration||||||||||||||||||||||||| |101.0||||||||||X|X|X||X|X|||||||||| |102.0||||||||||X|X|X||X|X|||||||||| |103.0||||||||||X|X|X||X|X|||||||||| |104.2 Items 1 & 2||||X|X|||||||||||||||||||| |104.3.1||||||||||X|X|X||X|X|||||||||| |104.4.3.1|X|||||||||||||||||||||||| |105.0||||||||||X|X|X||X|X||||||||||

    This state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.

    2 2025 CALIFORNIA PLUMBING CODE

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    CHAPTER 1

    ADMINISTRATION

    DIVISION I

    CALIFORNIA ADMINISTRATION

    1.1.0 General.

    1.1.1 Title. These regulations shall be known as the Califor- nia Plumbing Code, may be cited as such and will be referred to herein as “this code.” The California Plumbing Code is Part 5 of thirteen parts of the official compilation and publi- cation of the adoption, amendment, and repeal of plumbing regulations to the California Code of Regulations, Title 24, also referred to as the California Building Standards Code. This part incorporates by adoption the 2024 Uniform Plumb- ing Code of the International Association of Plumbing and Mechanical Officials with necessary California amendments.

    1.1.2 Purpose. The purpose of this code is to establish the minimum requirements to safeguard the public health, safety and general welfare through structural strength, means of egress facilities, stability, access to persons with disabilities, sanitation, adequate lighting and ventilation, and energy con- servation; safety to life and property from fire and other haz- ards attributed to the built environment; and to provide safety to fire fighters and emergency responders during emergency operations.

    1.1.3 Scope. The provisions of this code shall apply to the construction, alteration, movement, enlargement, replace- ment, repair, equipment, use and occupancy, location, main- tenance, removal, and demolition of every building or structure or any appurtenances connected or attached to such buildings or structures throughout the State of California.

  • CPC § 102.3 Medium relevance — show source text

    1

    CEBC—25: California Existing Building Code

    102.3, 1011.5.2, 1103.1, 1104.18, 1105.5.2

    CMC—25: California Mechanical Code

    201.3, 308.3, 605.1, 605.2.1.1, 605.2.1.2, 605.2.1.3, 605.2.1.4, 605.2.1.5, 605.3, 605.4, 605.4.2.3, 605.4.2.5, 605.5.2, 605.7, 606.1, 606.2, 608.1, 608.3, 608.4, 608.5, 608.8, 608.9.1, 608.10, 608.17, 610.1.1, 903.2.11.4, 904.14, 907.3.1, 909.1, 909.10.2, 909.13.1, 910.4.7, 915.6.1, 1006.2.2.3, 1011.16, 1020.6.1, 1207.4.7, 1207.6.1, 1207.6.1.2.2, 1207.11.8, 2104.2.1, 2105.3, 2301.1, 2301.6, 2309.3.1.2, 2311.3.1, 2311.4.3, 2311.8.2, 2311.8.8, 2311.8.10, 2404.9, 2404.9.2, 2504.5, 2703.2.2, 2703.10.4, 2703.14, 2803.2, 2803.3, 3001.1, 3003.1, 3004.2, 3108.12.1, 3108.12.2, 3703.5, 3804.1.1.7, 3904.1, 3905.3, Table 5003.1.1(1), 5003.8.4.2, 5003.8.5.2, 5003.8.6.2, 5004.3.1, 5303.7.6, 5303.16.9, 5305.5, 5306.2.2, 5306.2.3, 5307.4.4, 5504.2.1.3, 5504.2.2.3, 5505.4.1.1, 5701.3, 5703.6.1, 5704.2.8.9, 5705.3.7.5.1, 5706.2, 5706.4.4, 6003.1.3, 6003.2.3.2, 6004.2.2.7, 6005.3.1, 6005.3.2, 6103.2.1.7

    CPC—25: California Plumbing Code

  • CPC § 304.8 Medium relevance — show source text

    77
    74
    71
    68|142
    135
    129
    124
    120|201
    192
    183
    176
    170|429
    409
    392
    376
    363|772
    737
    705
    678
    653|1220
    1160
    1110
    1070
    1030|2540
    2420
    2320
    2230
    2140| |1600
    1700
    1800
    1900
    2000|1600
    1700
    1800
    1900
    2000|16
    15
    15
    14
    14|33
    31
    30
    30
    29|66
    64
    62
    60
    59|116
    112
    108
    105
    102|164
    159
    154
    149
    145|350
    339
    329
    319
    310|630
    610
    592
    575
    559|994
    962
    933
    906
    881|2070
    2000
    1940
    1890
    1830|

    For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m [3] /h, 1 pound-force per square inch = 6.8947 kPa

    Notes: 1 Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 2 Table entries are rounded to 3 significant digits.

    2025 CALIFORNIA PLUMBING CODE 247

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    FUEL GAS PIPING

  • CPC § 1323.13.3 Medium relevance — show source text

    2, 1323.13.3| |1326.4 - 1326.10|1326.5 - 1326.11| |1505.6 - 1505.14|1505.5 - 1505.13| |Figure 1505.10|Figure 1505.9| |1506.6 - 1506.13|1506.5 - 1506.12| |1603.3 - 1603.4|1603.4 - 1603.5| |Table 1603.4|Table 1603.5| |1603.5 - 1603.19|1603.6 - 1603.20| |1603.20|1503.2.4| |L 402.9 - L 402.11|L 402.8 - L 402.10| |L 404.9 - L 404.12|L 404.8 - L 404.11| |L 411.5, L 411.6|L 411.2, L411.3| |L 411.7|L 411.4| |L 411.9 - L 411.12|L 411.5 - L 411.8|

    xxii 2025 CALIFORNIA PLUMBING CODE

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    RELATED PUBLICATIONS AND SERVICES

    The Documents Listed are Not by this Reference Adopted by The State of California.

    IAPMO provides a variety of other products which are useful for inspectors, building officials, architects, engineers,

    manufacturers, contractors, plumbers, and apprentices.

    IAPMO Headquarters Directory

    4755 East Philadelphia Street, Ontario, California 91761-2816

    Publication Order Desk Phone: 800-85-IAPMO

    Publication Toll Free Fax: 877-85-CODES

    E-mail: iapmo@iapmo.org

    Website: www.iapmo.org

    Free Code Question: 800-201-0335

    Uniform Plumbing Code – 2024 Edition:

    The Uniform Plumbing Code is the most widely adopted plumbing code in the world. The 2024 edition contains complete “turnkey” requirements for the installation and maintenance of plumbing systems, all in one easy to use book.

    Uniform Plumbing Code Illustrated Training Manual:

    The UPC Illustrated Training Manual is an excellent reference for anyone involved in the plumbing industry. It contains an extensive definitions section and several hundred comprehensive technical diagrams and illustrations. It serves as a textbook, and it also is useful as a valuable tool for explaining the intent and use of the Code.

    Uniform Plumbing Code Study Guide:

    This book is the perfect complement to the UPC Illustrated Training Manual. Alone, it constitutes a complete self-study course for learning the UPC. It has hundreds of questions, general practice exams, and plumbing math, pipe sizing exercises and fitting identification. A big help in getting you ready for a certification exam!

    Guide to Important Code Questions to the Uniform Plumbing Code:

    An excellent reference for learning and understanding plumbing code changes and identifies code changes between editions. It is a useful tool for preparing code change proposals.

    Uniform Mechanical Code – 2024 Edition:

    The Uniform Mechanical Code contains complete requirements for the installation and maintenance of heating, ventilating, cooking and refrigeration systems.

    Uniform Mechanical Code Illustrated Training Manual:

    Contains technical diagrams and illustrations that demonstrate the intent and use of the UMC. A great reference for everyone involved in Mechanical HVACR design and installation.

    Uniform Mechanical Code Study Guide:

  • CPC § 1017.4 Medium relevance — show source text

    (b) Pumps shall be adequately sized and accessible.

    (c) Waste oil tanks shall have a 2 inch (50 mm) minimum pump-out connection at grade and an 1 [1] ⁄ 2 inch (40 mm) minimum vent to atmosphere at an approved location not less than 10 feet (3048 mm) above grade. 1017.4 Design of Interceptors. Each manufactured interceptor that is rated shall be stamped or labeled by the manufacturer with an indication of its full discharge rate in gpm (L/s). The following shall apply:

    (1) The full discharge rate to such an interceptor shall be determined at full flow. Each interceptor shall be rated equal to or greater than the incoming flow and shall be provided with an overflow line to an underground tank.

    (2) Interceptors not rated by the manufacturer shall have a depth of not less than 2 feet (610 mm) below the invert of the discharge drain. The outlet opening shall have not

    «

    200 2025 CALIFORNIA PLUMBING CODE

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    TRAPS AND INTERCEPTORS

    less than an 18 inch (457 mm) water seal and shall have a minimum capacity as follows:

    (a) Where not more than three motor vehicles are serviced, stored, or both, interceptors shall have a minimum capacity of 6 cubic feet (0.2 m [3] ), and 1 cubic foot (0.03 m [3] ) of capacity shall be added for each vehicle up to 10 vehicles.

    (b) Above 10 vehicles, the Authority Having Jurisdiction shall determine the size of the interceptor required.

    (c) Where vehicles are serviced and not stored, interceptor capacity shall be based on a net capacity of 1 cubic foot (0.03 m [3] ) for each 100 square feet (9.29 m [2] ) of the surface to be drained into the interceptor, with a minimum of 6 cubic feet (0.2 m [3] ).

    2025 CALIFORNIA PLUMBING CODE 201

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    202 2025 CALIFORNIA PLUMBING CODE

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    CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

    CHAPTER 11 - STORM DRAINAGE

    (Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

  • CPC § 0.2 Medium relevance — show source text

    «

    200 2025 CALIFORNIA PLUMBING CODE

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    TRAPS AND INTERCEPTORS

    less than an 18 inch (457 mm) water seal and shall have a minimum capacity as follows:

    (a) Where not more than three motor vehicles are serviced, stored, or both, interceptors shall have a minimum capacity of 6 cubic feet (0.2 m [3] ), and 1 cubic foot (0.03 m [3] ) of capacity shall be added for each vehicle up to 10 vehicles.

    (b) Above 10 vehicles, the Authority Having Jurisdiction shall determine the size of the interceptor required.

    (c) Where vehicles are serviced and not stored, interceptor capacity shall be based on a net capacity of 1 cubic foot (0.03 m [3] ) for each 100 square feet (9.29 m [2] ) of the surface to be drained into the interceptor, with a minimum of 6 cubic feet (0.2 m [3] ).

    2025 CALIFORNIA PLUMBING CODE 201

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    202 2025 CALIFORNIA PLUMBING CODE

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

    CHAPTER 11 - STORM DRAINAGE

    (Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

    Adopting Agency BSC BSC-
    CG    		 SFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 Col17 BSCC DPH AGR DWR CEC CA SL SLC
    Adopting Agency BSC BSC-
    CG    		 SFM 1 2 1-AC AC ** SS** SS/CC 1 1R 2 3 4 5 6 6 6 6 6 6 6 6 6
    Adopt Entire Chapter X X X
    Adopt Entire Chapter as
    amended (amended
    sections listed below)    		 X X X X X X X X
    Adopt only those sections
    that are listed below
    Chapter/Section
    1101.
  • California Plumbing Code Medium relevance — show source text


    (feet)|LATERAL
    L
    (feet)**|Min|Max|Max|Min|Max|Max|Min|Max|Max|Min|Max|Max|Min|Max|Max| |6|2
    5|NA
    NA|NA
    NA|28
    25|NA
    NA|NA
    NA|52
    49|NA
    NA|NA
    NA|86
    82|NA
    NA|NA
    NA|130
    117|NA
    NA|NA
    NA|180
    165| |8|2
    5
    8|NA
    NA
    NA|NA
    NA
    NA|29
    26
    24|NA
    NA
    NA|NA
    NA
    NA|55
    52
    48|NA
    NA
    NA|NA
    NA
    NA|93
    88
    83|NA
    NA
    NA|NA
    NA
    NA|145
    134
    127|NA
    NA
    NA|NA
    NA
    NA|198
    183
    175| |10|2
    5
    10|NA
    NA
    NA|NA
    NA
    NA|31
    28
    25|NA
    NA
    NA|NA
    NA
    NA|61
    57
    50|NA
    NA
    NA|NA
    NA
    NA|103
    96
    87|NA
    NA
    NA|NA
    NA
    NA|162
    148
    139|NA
    NA
    NA|NA
    NA
    NA|221
    204
    191| |15|2
    5
    10
    15|NA
    NA
    NA
    NA|NA
    NA
    NA
    NA|35
    35
    28
    NA|NA
    NA
    NA
    NA|NA
    NA
    NA
    NA|67
    62
    55
    48|NA
    NA
    NA
    NA|NA
    NA
    NA
    NA|114
    107
    97
    89|NA
    NA
    NA
    NA|NA
    NA
    NA
    NA|179
    164
    153
    141|53
    NA
    NA
    NA|475
    NA
    NA
    NA|250
    231
    216
    201| |20|2
    5

  • CPC § 705.10 Medium relevance — show source text

    Waste,
    and Vent (DWV), Sewer, Sanitary, and Storm Plumbing Sys-
    tems for Above and Below Ground Use|Joints|705.10|

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    REFERENCED STANDARDS

    TABLE 1701.1 (continued) REFERENCED STANDARDS

    STANDARD NUMBER STANDARD TITLE APPLICATION REFERENCED
    SECTION
    ASTM C1540-2020 Standard Specification for Heavy-Duty Shielded Couplings
    Joining Hubless Cast Iron Soil Pipe and Fittings    		 Joints 705.2.2
    ASTM C1563-2008
    (R2021)    		 Standard Test Method for Gaskets for Use in Connection with
    Hub and Spigot Cast Iron Soil Pipe and Fittings for Sanitary
    Drain, Waste, Vent, and Storm Piping Applications    		 Joints 705.2.2
    ASTM C1822-2021 Standard Specification for Insulating Covers on Accessible
    Lavatory Piping    		 Miscellaneous 403.3
    ASTM D1253-2014 Standard Test Method for Residual Chlorine in Water Miscellaneous 1506.10.6, 1603.4.1
    ASTM D1785-2021a Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic
    Pipe, Schedules 40, 80, and 120    		 Piping Table 604.1, Table
    701.2
    ASTM D2235-2021 Standard Specification for Solvent Cement for Acrylonitrile-
    Butadiene-Styrene (ABS) Plastic Pipe and Fittings    		 Joints 705.1.2
    ASTM D2239-2021 Standard Specification for Polyethylene (PE) Plastic Pipe
    (SIDR-PR) Based on Controlled Inside Diameter    		 Piping Table 604.1
    ASTM D2241-2020 Standard Specification for Poly (Vinyl Chloride) (PVC) Pressure-
    Rated Pipe (SDR Series)    		 Piping Table 604.1
    ASTM D2464-2015 Standard Specification for Threaded Poly (Vinyl Chloride)
    (PVC) Plastic Pipe Fittings, Schedule 80    		 Fittings Table 604.1
    ASTM D2466-2021 Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic
    Pipe Fittings, Schedule 40    		 Fittings Table 604.1
    ASTM D2467-2020 Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic
    Pipe Fittings, Schedule 80    		 Fittings Table 604.1
    ASTM D2513-2020 Standard Specification for Polyethylene (PE) Gas Pressure
    Pipe, Tubing, and Fittings    		 Piping 1208.5.4, 1208.5.6.2,
    1208.5.10.2,
    1210.1.7.1(1)
    ASTM D2564-2020 Standard Specification for Solvent Cements for Poly (Vinyl
    Chloride) (PVC) Plastic Piping Systems    		 Joints 605.12.2, 705.6.
  • California Plumbing Code Medium relevance — show source text


    5
    10|NA
    NA
    NA|NA
    NA
    NA|31
    28
    25|NA
    NA
    NA|NA
    NA
    NA|61
    57
    50|NA
    NA
    NA|NA
    NA
    NA|103
    96
    87|NA
    NA
    NA|NA
    NA
    NA|162
    148
    139|NA
    NA
    NA|NA
    NA
    NA|221
    204
    191| |15|2
    5
    10
    15|NA
    NA
    NA
    NA|NA
    NA
    NA
    NA|35
    35
    28
    NA|NA
    NA
    NA
    NA|NA
    NA
    NA
    NA|67
    62
    55
    48|NA
    NA
    NA
    NA|NA
    NA
    NA
    NA|114
    107
    97
    89|NA
    NA
    NA
    NA|NA
    NA
    NA
    NA|179
    164
    153
    141|53
    NA
    NA
    NA|475
    NA
    NA
    NA|250
    231
    216
    201| |20|2
    5
    10
    15
    20|NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA|38
    36
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA|74
    68
    60
    NA
    NA|NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA|124
    116
    107
    97
    83|NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA|201
    184
    172
    159
    148|51
    80
    NA
    NA
    NA|522
    503
    NA
    NA
    NA|274
    254
    237
    220
    206| |30|2
    5

  • California Plumbing Code Medium relevance — show source text


    (feet)|LATERAL
    L
    (feet)|FAN|FAN|NAT|FAN|FAN|NAT|FAN|FAN|NAT|FAN|FAN|NAT|FAN|FAN|NAT| |HEIGHT
    H
    (feet)|LATERAL
    L
    (feet)**|Min|Max|Max|Min|Max|Max|Min|Max|Max|Min|Max|Max|Min|Max|Max| |6|0
    2
    4
    6|0
    178
    242
    276|2983
    1769
    1761
    1753|1530
    1170
    1160
    1150|0
    225
    300
    341|3802
    2250
    2242
    2235|1960
    1480
    1475
    1470|0
    296
    390
    437|4721
    2782
    2774
    2767|2430
    1850
    1835
    1820|0
    360
    469
    523|5737
    3377
    3370
    3363|2950
    2220
    2215
    2210|0
    426
    555
    618|6853
    4030
    4023
    4017|3520
    2670
    2660
    2650| |8|0
    2
    5
    8|0
    168
    251
    289|3399
    2030
    2013
    2000|1740
    1340
    1330
    1320|0
    212
    311
    354|4333
    2584
    2563
    2552|2220
    1700
    1685
    1670|0
    278
    398
    450|5387
    3196
    3180
    3163|2750
    2110
    2090
    2070|0
    336
    476
    537|6555
    3882
    3863
    3850|3360
    2560
    2545
    2530|0
    401
    562
    630|7838
    4634
    4612
    4602|4010
    3050
    3040
    3030| |10|0
    2
    5
    10|0
    161
    243
    298|3742
    2256
    2238
    2209|1925
    1480
    1461
    1430|0
    202
    300
    364|4782
    2868
    2849
    2818|2450
    1890
    1871
    1840|0

  • California Plumbing Code Medium relevance — show source text


    2
    5
    10
    15|36
    38
    51
    NA
    NA|93
    69
    63
    NA
    NA|57
    47
    44
    39
    NA|56
    57
    75
    95
    NA|190
    136
    128
    116
    NA|111
    93
    86
    79
    72|80
    80
    102
    128
    158|325
    225
    216
    201
    186|186
    149
    140
    131
    124|116
    115
    144
    182
    220|499
    337
    326
    308
    290|283
    224
    217
    203
    192|153
    148
    182
    228
    272|713
    473
    459
    438
    418|388
    314
    298
    284
    269| |20|0
    2
    5
    10
    15
    20|35
    37
    50
    NA
    NA
    NA|96
    74
    68
    NA
    NA
    NA|60
    50
    47
    41
    NA
    NA|54
    56
    73
    93
    NA
    NA|200
    148
    140
    129
    NA
    NA|118
    99
    94
    86
    80
    NA|78
    78
    100
    125
    155
    186|346
    248
    239
    223
    208
    192|201
    165
    158
    146
    136
    126|114
    113
    141
    177
    216
    254|537
    375
    363
    344
    325
    306|306
    248
    239
    224
    210
    196|149
    144
    178
    222
    264
    309|772
    528
    514
    491
    469
    448|428
    344
    334
    316
    301
    285| |30|0
    2
    5

  • CPC § 201.1 Medium relevance — show source text

    SECTION 201—GENERAL

    201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code, have the meanings shown in this chapter.

    201.2 Interchangeability. Words used in the present tense include the future; words stated in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular.

    201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the other California Codes, such terms shall have the meanings ascribed to them in those codes. [OSHPD 1, 1R, 2, 4 & 5] For terms not defined in this chapter, refer to Chapters 6 and 7 of the California Administrative Code, and Chapter 2 of the California Building Code. [DSA-SS & DSA-SS/CC] Definitions of terms given in Section 4-207 or 4-314 of the California Administrative Code govern over those in Section 202.

    201.4 Terms not defined. Where terms are not defined through the methods authorized by this chapter, such terms shall have ordinarily accepted meanings such as the context implies.

    SECTION 202—GENERAL DEFINITIONS

    ACCESSORY DWELLING UNIT. [HCD 1 & HCD 2] An attached or detached residential dwelling unit that provides complete independent living facilities for one or more persons and is located on a lot with a proposed or existing primary residence. Accessory dwelling units shall include permanent provisions for living, sleeping, eating, cooking and sanitation on the same parcel as the single-family or multi- family dwelling is or will be situated. (See Government Code Section 65852.2.)

    [A] ADDITION. An extension or increase in floor area, number of stories, or height of a building or structure.

    [A] ALTERATION. Any construction or renovation to an existing structure other than a repair or addition.

    [BG] AMBULATORY CARE FACILITY. Buildings or portions thereof used to provide medical, surgical, psychiatric, nursing or similar care on a less than 24-hour basis to persons who are rendered incapable of self-preservation by the services provided or staff has accepted responsibility for care recipients already incapable.

    [A] APPROVED. Acceptable to the code official.

    Exception: [HCD 1 & HCD 2] “Approved” means meeting the approval of the Enforcing Agency, except as otherwise provided by law, when used in connection with any system, material, type of construction, fixture or appliance as the result of investigations and tests conducted by the agency, or by reason of accepted principles or tests by national authorities, or technical, health, or scientific organi- zations or agencies.

    Notes :

    1. See Health and Safety Code Section 17920 for “Approved” as applied to residential construction and buildings or struc- tures accessory thereto as referenced in Section 1.8.2. 2. See Health and Safety Code Section 17921.1 for “Approved” as applied to the use of hotplates in residential construction as referenced in Section 1.8.2.

    3. See Health and Safety Code Section 19966 for “Approved” as applied to Factory-Built Housing as referenced in Section 1.8.3.2.5.

  • CPC § 1.11. Medium relevance — show source text

    REPAIR|||X|||||||||||||||||||||| |ROOF REPLACEMENT|||X|||||||||||||||||||||| |SPC SEISMIC SEPARATION||||||||||X|X|||||||||||||| |SUBSTANDARD BUILDING||||X|X|||||||||||||||||||| |SUBSTANTIAL STRUCTURAL
    DAMAGE||||||||||X|X|||||||||||||| |UNREINFORCED CONCRETE||||||||||X|X|X||X|X|||||||||| |UNREINFORCED MASONRY||||||||||X|X|X||X|X|||||||||| |UNSAFE|||X|X|X|||||||||||||||||||| |VOLUNTARY STRUCTURAL
    IMPROVEMENTS||||||||||X|X|X||X|X|||||||||| |WORK AREA|||X||||||||||||||||||||||

    The state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.

    2-2 2025 CALIFORNIA EXISTING BUILDING CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    2 DEFINITIONS

    User notes:

    About this chapter: Codes, by their very nature, are technical documents. Every word, term and punctuation mark can add to or change the meaning of a technical requirement. It is necessary to maintain a consensus on the specific meaning of each term contained in the code. Chapter 2 performs this function by stating clearly what specific terms mean for the purpose of the code.

    SECTION 201—GENERAL

    201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code, have the meanings shown in this chapter.

    201.2 Interchangeability. Words used in the present tense include the future; words stated in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular.

    201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the other California Codes, such terms shall have the meanings ascribed to them in those codes. [OSHPD 1, 1R, 2, 4 & 5] For terms not defined in this chapter, refer to Chapters 6 and 7 of the California Administrative Code, and Chapter 2 of the California Building Code. [DSA-SS & DSA-SS/CC] Definitions of terms given in Section 4-207 or 4-314 of the California Administrative Code govern over those in Section 202.

    201.4 Terms not defined. Where terms are not defined through the methods authorized by this chapter, such terms shall have ordinarily accepted meanings such as the context implies.

    SECTION 202—GENERAL DEFINITIONS

    ACCESSORY DWELLING UNIT. [HCD 1 & HCD 2] An attached or detached residential dwelling unit that provides complete independent living facilities for one or more persons and is located on a lot with a proposed or existing primary residence. Accessory dwelling units shall include permanent provisions for living, sleeping, eating, cooking and sanitation on the same parcel as the single-family or multi- family dwelling is or will be situated. (See Government Code Section 65852.2.)

  • CPC § 201.1 Medium relevance — show source text

    201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code, have the meanings shown in this chapter.

    201.2 Interchangeability. Words used in the present tense include the future; words stated in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular.

    201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the California Energy Code, Califor- nia Existing Building Code, California Fire Code, California Green Building Standards Code, California Electrical Code, California Mechanical Code or California Plumbing Code, such terms shall have the meanings ascribed to them as in those codes.

    201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies.

    For applications listed in Section 1.11 regulated by the Office of the State Fire Marshal, where terms are not defined through the meth- ods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies. Webster’s Third New International Dictionary of the English Language, Unabridged, shall be considered as providing ordinarily accepted meanings.

    SECTION 202—DEFINITIONS

    [BG] 24-HOUR BASIS. The actual time that a person is an occupant within a facility for the purpose of receiving care. It shall not include a facility that is open for 24 hours and is capable of providing care to someone visiting the facility during any segment of the 24 hours.

    [BS] AAC MASONRY. Masonry made of autoclaved aerated concrete (AAC) units, manufactured without internal reinforcement and bonded together using thin- or thick-bed mortar.

    ACCESS AISLE. [DSA-AC] An accessible space adjacent to or between vehicle spaces that provides clearances in compliance with this code.

    ACCESSIBILITY. [DSA-AC & HCD 1-AC] The combination of various elements in a building, facility, site or area, or portion thereof which allows access, circulation and the full use of the building and facilities by persons with disabilities in compliance with this code.

    ACCESSIBILITY FUNCTION BUTTON. [DSA-AC] A button on an elevator hall call console in a destination-oriented elevator system that when pressed will activate a series of visual and verbal prompts and announcements providing instruction regarding hall call console operation and direction to an assigned elevator.

    ACCESSIBLE. [DSA-AC & HCD 1-AC] A site, building, facility, or portion thereof that is approachable and usable by persons with disabili- ties in compliance with this code.

    ACCESSIBLE ELEMENT. [DSA-AC] An element specified by the regulations adopted by the Division of the State Architect—Access Compliance.

    [BE] ACCESSIBLE MEANS OF EGRESS. A continuous and unobstructed way of egress travel from any accessible point in a building or facility to a public way.

  • CPC § 1.5 Medium relevance — show source text

    The California Code of Regulations (CCR), Title 14, Division 1.5 provisions that are found in the California Wildland-Urban Interface Code are not listed in the Matrix Adoption Tables as they are not within the State Fire Marshal’s authority to adopt. These provisions are a reprint from the current CCR, Title 14, Division 1.5 text for the code user’s convenience only and are identified in the body of the code by square brackets containing references to applicable Title 14 sections.

    2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE 2-1

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    2-2 2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    2 DEFINITIONS

    User notes:

    About this chapter: Codes, by their very nature, are technical documents. Every word, term and punctuation mark can add to or change the meaning of a technical requirement. It is necessary to maintain a consensus on the specific meaning of each term contained in the code. Chapter 2 performs this function by stating clearly what specific terms mean for the purpose of the code.

    SECTION 201—GENERAL

    201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code, have the meanings shown in this chapter.

    201.2 Interchangeability. Words stated in the present tense include the future; words stated in the masculine gender include the feminine and neuter; and the singular number includes the plural and the plural the singular.

    201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the California Building Code, Cali- fornia Existing Building Code, California Fire Code, California Electrical Code, California Mechanical Code or California Plumbing Code, such terms shall have the meanings ascribed to them as in those codes.

    201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have their ordinarily accepted meanings such as the context implies.

    SECTION 202—DEFINITIONS

    ACCESSORY STRUCTURE. A building or structure used to shelter or support any material, equipment, chattel or occupancy other than a habitable building.

    AGRICULTURE (applicable to CCR, Title 14 provisions only). Land used for agricultural purposes as defined in a Local Jurisdiction's zoning ordinances. [CCR Title 14 §1270.01(a)]

    APPLICABLE BUILDING. A building that has residential, commercial, educational, institutional or similar occupancy type use.

    [A] APPROVED. Acceptable to the code official.

    [A] APPROVED AGENCY. An established and recognized organization that is regularly engaged in conducting tests, furnishing inspection services or furnishing product evaluation or certification where such organization has been approved by the code official.

    [A] BUILDING. Any structure intended for supporting or sheltering any occupancy.

    BUILDING (applicable to CCR, Title 14 provisions only). Any Structure used or intended for supporting or sheltering any use or Occupancy, except those classified as Utility and Miscellaneous Group U. [CCR Title 14 §1270.01(c)]

  • CPC § 2-4 Medium relevance — show source text

    2-4 2025 CALIFORNIA FIRE CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    2 DEFINITIONS

    User notes:

    About this chapter: Codes, by their very nature, are technical documents. Every word, term and punctuation mark can add to or change the meaning of a technical requirement. It is necessary to maintain a consensus on the specific meaning of each term contained in the code. Chapter 2 performs this function by stating clearly what specific terms mean for the purpose of the code. General definitions are located in Section 202 and occupancy classification definitions are located in Section 203.

    SECTION 201—GENERAL

    201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code, have the meanings shown in this chapter.

    201.2 Interchangeability. Words used in the present tense include the future; words stated in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular.

    201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the California Building Code, Cali- fornia Mechanical Code or California Plumbing Code, such terms shall have the meanings ascribed to them as in those codes.

    201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies. Merriam Webster’s Collegiate Dictionary, 11th Edition, shall be considered as providing ordinarily accepted meanings.

    SECTION 202—GENERAL DEFINITIONS

    [BG] 24-HOUR BASIS. The actual time that a person is an occupant within a facility for the purpose of receiving care. It shall not include a facility that is open for 24 hours and is capable of providing care to someone visiting the facility during any segment of the 24 hours.

    3D PRINTER. A machine used in the additive manufacturing process for fabricating objects through the deposition of a material using a print head, nozzle or other printer technology.

    [M] ACCESS (TO). That which enables a device, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel or similar obstruction [see also “Ready access (to)”].

    [BE] ACCESSIBLE MEANS OF EGRESS. A continuous and unobstructed way of egress travel from any accessible point in a building or facility to a public way.

    [BE] ACCESSIBLE ROUTE. A continuous, unobstructed path that complies with Chapter 11 of the California Building Code .

    ACTIVE RF EMITTING DEVICE. Any type of circuit component that requires an AC or DC power source with the ability to electrically control electron flow and/or amplification of RF signal, including but not limited to signal boosters, repeaters, bidirectional amplifiers and fiber-distributed antenna systems.

    ADDITIVE MANUFACTURING. A process of joining materials to make objects from 3D model data, usually layer upon layer, sometimes referred to as 3D printing. This code recognizes two types of additive manufacturing:

    Industrial additive manufacturing. 3D printing operations that typically utilize combustible powders or metals, an inert gas supply, a combustible dust collection system, or that create a hazardous (classified) location area or zone outside the equipment.

  • CPC § 7.3 Medium relevance — show source text

    3|7.3|9.9|14.6| |26|NP|NP|NP|NP|13.2|22.4|NP|NP|5.0|8.5|11.4|16.9| |28|NP|NP|NP|NP|15.1|25.7|NP|NP|5.7|9.7|13.1|19.4| |30|NP|NP|NP|NP|17.2|NP|NP|NP|6.5|11.0|14.9|22.0| |32|NP|NP|NP|NP|19.4|NP|NP|NP|7.3|12.4|16.8|24.8| |34|NP|NP|NP|NP|21.7|NP|NP|NP|8.2|13.9|18.8|NP| |36|NP|NP|NP|NP|24.1|NP|NP|NP|9.1|15.4|20.9|NP| |For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 0.063 L/s, 1 pound per square inch = 6.895 kPa.
    NP = Not Permitted. Pressure loss exceeds reasonable limits.
    a. Values are applicable for underground piping materials listed in_ the California Plumbing Code_ and are based on an SDR of 11 and a Hazen Williams C Factor of 150.
    b. Values include the following length allowances for fittings: 25-percent length increase for actual lengths up to 100 feet and 15-percent length increase for actual lengths over
    100 feet.
    c. Flow rate from Section P2904.4.2. Add 5 gpm to the flow rate required by Section_R309.3.4.2_ where the water service pipe supplies more than one dwelling.|For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 0.063 L/s, 1 pound per square inch = 6.895 kPa.
    NP = Not Permitted. Pressure loss exceeds reasonable limits.
    a. Values are applicable for underground piping materials listed in_ the California Plumbing Code_ and are based on an SDR of 11 and a Hazen Williams C Factor of 150.
    b. Values include the following length allowances for fittings: 25-percent length increase for actual lengths up to 100 feet and 15-percent length increase for actual lengths over
    100 feet.
    c. Flow rate from Section P2904.4.2. Add 5 gpm to the flow rate required by Section_R309.3.4.2_ where the water service pipe supplies more than one dwelling.|For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 0.063 L/s, 1 pound per square inch = 6.895 kPa.
    NP = Not Permitted. Pressure loss exceeds reasonable limits.
    a. Values are applicable for underground piping materials listed in_ the California Plumbing Code_ and are based on an SDR of 11 and a Hazen Williams C Factor of 150.
    b. Values include the following length allowances for fittings: 25-percent length increase for actual lengths up to 100 feet and 15-percent length increase for actual lengths over
    100 feet.
    c. Flow rate from Section P2904.4.2.

  • CPC § 201.3 Medium relevance — show source text

    201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the California Building Code, Cali- fornia Existing Building Code, California Fire Code, California Electrical Code, California Mechanical Code or California Plumbing Code, such terms shall have the meanings ascribed to them as in those codes.

    201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have their ordinarily accepted meanings such as the context implies.

    SECTION 202—DEFINITIONS

    ACCESSORY STRUCTURE. A building or structure used to shelter or support any material, equipment, chattel or occupancy other than a habitable building.

    AGRICULTURE (applicable to CCR, Title 14 provisions only). Land used for agricultural purposes as defined in a Local Jurisdiction's zoning ordinances. [CCR Title 14 §1270.01(a)]

    APPLICABLE BUILDING. A building that has residential, commercial, educational, institutional or similar occupancy type use.

    [A] APPROVED. Acceptable to the code official.

    [A] APPROVED AGENCY. An established and recognized organization that is regularly engaged in conducting tests, furnishing inspection services or furnishing product evaluation or certification where such organization has been approved by the code official.

    [A] BUILDING. Any structure intended for supporting or sheltering any occupancy.

    BUILDING (applicable to CCR, Title 14 provisions only). Any Structure used or intended for supporting or sheltering any use or Occupancy, except those classified as Utility and Miscellaneous Group U. [CCR Title 14 §1270.01(c)]

    [A] BUILDING OFFICIAL. The officer or other designated authority charged with the administration and enforcement of the California Building Code, or the building official’s duly authorized representative.

    CERTIFICATE OF COMPLETION. Written documentation that the project or work for which a permit was issued has been completed in conformance with requirements of this code.

    [A] CODE OFFICIAL. The official designated by the jurisdiction to interpret and enforce this code, or the code official’s authorized representative.

    CRITICAL FIRE WEATHER. A set of weather conditions (usually a combination of low relative humidity and wind) whose effects on fire behavior make control difficult and threaten firefighter safety.

    DEAD-END ROAD (applicable to CCR, Title 14 provisions only). A road that has only one point of vehicular ingress/egress, including cul-de- sacs and roads that loop back on themselves. [CCR Title 14 §1270.01(e)]

    DEFENSIBLE SPACE. See Sections 403.1.1 and 601.3.

    DRIVEWAY (applicable to CCR, Title 14 provisions only). A vehicular pathway route that serves not more than four (4) Residential Units and any number of noncommercial or nonindustrial Utility or Miscellaneous Group U Buildings. [CCR Title 14 §1270.01(i)]

    [BG] DWELLING. A building that contains one or two dwelling units used, intended or designed to be used, rented, leased, let or hired out to be occupied for living purposes.

  • CPC § 1.11 Medium relevance — show source text

    R201.2 Interchangeability. Words used in the present tense include the future; words in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular.

    R201.3 Terms defined in other codes. Where terms are not defined in this code such terms shall have the meanings ascribed in the California Building Standards Code, Title 24, California Code of Regulations.

    R201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies.

    For applications listed in Section 1.11 regulated by the Office of the State Fire Marshal, where terms are not defined through the meth- ods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies. Webster’s Third New International Dictionary of the English Language, Unabridged, shall be considered as providing ordinarily accepted meanings.

    SECTION R202—DEFINITIONS

    [RB] ACCESS (TO). That which enables a device, an appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction.

    ACCESSORY DWELLING UNIT. [HCD 1 & HCD 2] An attached or detached residential dwelling unit that provides complete independent living facilities for one or more persons and is located on a lot with a proposed or existing primary residence. Accessory dwelling units shall include permanent provisions for living, sleeping, eating, cooking and sanitation on the same parcel as the single-family or multifamily dwelling is or will be situated. (See Government Code Section 65852.2)

    [RB] ACCESSORY STRUCTURE. A structure that is accessory to and incidental to that of the dwelling(s) or townhouse(s) and that is located on the same lot.

    [RB] ADDITION. An extension or increase in floor area, number of stories or height of a building or structure.

    [RB] ADHERED STONE OR MASONRY VENEER. Stone or masonry veneer secured and supported through the adhesion of an approved bonding material applied to an approved backing.

    AGED HOME OR INSTITUTION. A facility used for the housing of persons 65 years of age or older in need of care and supervision. (See defi- nition of “care and supervision.”)

    [MP] AIR, OUTDOOR. Ambient air that enters a building through a ventilation system, through intentional openings for natural ventilation or by infiltration.

    [MP] AIR, TRANSFER. Air moved from one indoor space to another.

    [MP] AIR ADMITTANCE VALVE. A one-way valve designed to allow air into the plumbing drainage system where a negative pressure develops in the piping. This device shall close by gravity and seal the terminal under conditions of zero differential pressure (no flow conditions) and under positive internal pressure.

    [MP] AIR BREAK (DRAINAGE SYSTEM). An arrangement where a discharge pipe from a fixture, appliance or device drains indirectly into a receptor below the flood-level rim of the receptor and above the trap seal.

    [MP] AIR CIRCULATION, FORCED. A means of providing space conditioning utilizing movement of air through ducts or plenums by mechanical means.

    [MP] AIR GAP, DRAINAGE SYSTEM. The unobstructed vertical distance through free atmosphere between the outlet of a waste pipe and the flood-level rim of the fixture or receptor into which it is discharging.

  • CPC § 413.2 Medium relevance — show source text

    Flushometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .413.2

    Fuel gas meters . . . . . . . . . . . . . . . .1208.7.1, E 402.4.1 Fuel gas piping . . . . . . . . . . . . . . . .1210.3.3.1, 1210.4.4 Fuel gas pressure regulators . . . . . . .1208.7.2, 1210.5.1 Fullway valves . . . . . . . . . . . . . . . . . . . . . . .606.2, 710.6 Grease interceptors . . . . . . . . . . . . . . . . . . . . . .1014.3.4 Indirect waste receptors . . . . . . . . . . . . . . . . . . . .804.1 Interceptors . . . . . . . . . . . . . . . . . . . . . .1009.3, 1009.5, 1016.4, H 901.5

    Lapped flanges . . . . . . . . . . . . . . . . . . . . . . .1208.5.11.7

    Manholes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 501.12

    Meters and submeters . . . . . . . . . . . . . 601.2.1, 601.2.1.1,

    601.2.1.2, L 407.4 Plumbing fixtures . . . . . . . . . . . . . . . . . . . . . . . . . .402.1 Pool heaters on/off switch . . . . . . . . . . . . . .L 503.3.6(1) Rainwater storage tanks . . . . . . .1603.4, 1603.5, 1603.6, K 105.0, K 105.3.1 Septic tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 501.5 Shutoff valves . . . . . . . . . . . . . . . .606.3, 606.6, 1210.9,

    1210.9.1, 1210.9.2,

    1210.9.4, 1212.5.3,

    1212.6, 1327.2,

    E 403.9, E 403.13(2), E 403.13(6) Sumps . . . . . . . . . . . . . . . . . . . . . . . . . . . .710.10, 810.3

    Toilet facilities . . . . . . . . . . . . . . . . . . . . . . . . . . . .422.4

  • CPC § 2-3 Medium relevance — show source text

    SYSTEM||||X|||||||||||||||||||| |VENTILATION||||X|||||||||||||||||||| |WATER HEATER||||X|||||||||||||||||||| |WHOLE-HOUSE MECHANICAL
    VENTILATION SYSTEM||||X|||||||||||||||||||| |WILDLAND-URBAN INTERFACE (WUI)|||X|||||||||||||||||||||

    The state agency does not adopt sections identified with the following symbol: †

    2025 CALIFORNIA RESIDENTIAL CODE 2-3

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    2-4 2025 CALIFORNIA RESIDENTIAL CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    Part II—Definitions

    2 DEFINITIONS

    User notes:

    About this chapter: Codes, by their very nature, are technical documents. Every word, term and punctuation mark can add to or change the meaning of a technical requirement. It is necessary to maintain a consensus on the specific meaning of each term contained in the code. Chapter 2 performs this function by stating clearly what specific terms mean for the purpose of the code.

    ICC code development note: Code change proposals to definitions in this chapter preceded by a bracketed letter are considered by the IRC—Building Code Development Committee [RB], the IRC—Mechanical/Plumbing Code Development Committee [MP] or the IECC—Residential Code Development Committee [RE] during the Group B (2025) Code Development Cycle.

    SECTION R201—GENERAL

    R201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code, have the meanings indicated in this chapter.

    R201.2 Interchangeability. Words used in the present tense include the future; words in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular.

    R201.3 Terms defined in other codes. Where terms are not defined in this code such terms shall have the meanings ascribed in the California Building Standards Code, Title 24, California Code of Regulations.

    R201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies.

    For applications listed in Section 1.11 regulated by the Office of the State Fire Marshal, where terms are not defined through the meth- ods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies. Webster’s Third New International Dictionary of the English Language, Unabridged, shall be considered as providing ordinarily accepted meanings.

    SECTION R202—DEFINITIONS

    [RB] ACCESS (TO). That which enables a device, an appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction.

    ACCESSORY DWELLING UNIT. [HCD 1 & HCD 2] An attached or detached residential dwelling unit that provides complete independent living facilities for one or more persons and is located on a lot with a proposed or existing primary residence. Accessory dwelling units shall include permanent provisions for living, sleeping, eating, cooking and sanitation on the same parcel as the single-family or multifamily dwelling is or will be situated. (See Government Code Section 65852.2)

  • California Plumbing Code Medium relevance — show source text

    |204
    |420
    |629
    |1210
    |1930
    |3410
    |6960
    | |1200
    |50
    |104
    |195
    |400
    |600
    |1160
    |1840
    |3260
    |6640
    | |1300
    |47
    |99
    |187
    |384
    |575
    |1110
    |1760
    |3120
    |6360
    | |1400
    |46
    |95
    |179
    |368
    |552
    |1060
    |1690
    |3000
    |6110
    | |1500
    |44
    |92
    |173
    |355
    |532
    |1020
    |1630
    |2890
    |5890
    | |1600
    |42
    |89
    |167
    |343
    |514
    |989
    |1580
    |2790
    |5680
    | |1700
    |41
    |86
    |162
    |332
    |497
    |957
    |1530
    |2700
    |5500
    | |1800
    |40
    |83
    |157
    |322
    |482
    |928
    |1480
    |2610
    |5330
    | |1900
    |39
    |81
    |152
    |312
    |468
    |901
    |1440
    |2540
    |5180
    | |2000|38|79|148|304|455|877|1400|2470|5040|

  • CPC § 201.1 Medium relevance — show source text


    Division 1
    Section|Gov Code
    Section|PRC
    Section|HSC
    Section| |---|---|---|---|---|---|---|---|---|---|---| |Section|Title|Title|Title|Title|Title|Title|Title|Title|Title|Title| |Chapter 2|Definitions|Definitions|Definitions|Definitions|Definitions|Definitions|Definitions|Definitions|Definitions|Definitions| |201|General|Y||||||||| |201.1|Scope|Y||||||||| |201.2|Interchangeability|Y||||||||| |201.3|Terms defined in
    other codes|Y||201.3||||||| |201.4|Terms not defined|Y||||||||| |202|Definitions|Y||||||||| ||Accessory structure|Y||||||||| ||Agriculture (T14)|Y||||1270.01(1)||||| ||Applicable building|Y||702A||||||| ||Approved|Y||||||||| ||Approved agency|Y||||||||| ||Building|Y||||1270.01(c)||||| ||Building (T14)|Y||||||||| ||Building official|Y||||||||| ||Certificate of
    completion|Y||||||||| ||Code official|Y||||||||| ||Critical fire weather|Y||||||||| ||Dead-end road (T14)|Y||||1270.01(e)||||| ||Defensible space (T14)|Y||||||||| ||Driveway (T14)|Y||||||||| ||Dwelling|Y||702A||1270.01(i)||||| ||Exterior wall assembly|Y||702A||||||| ||Exterior wall covering|Y||702A||||||| ||Fire chief|Y||||||||| ||Fire code official|Y|||202|||||| ||Fire flow calculation
    area|Y||||||||| ||Fire hazard severity
    zones|Y||702A|4902.1|||2201||| ||Fire protection plan|Y||702A|4902.1|||||| ||Fire weather|Y||||||||| ||Fire-resistance-rated
    construction|Y||||||||| ||Fire-smart vegetation|Y|||4902.1|1271.01||||| ||Flame spread index|Y||||||||| ||Fuel|Y||||||||4291(a)(1)(A)| ||Fuel break_(T14)|Y||||1270.01(n)||||| ||Fuel modification|Y||||||||| ||Fuel mosaic|Y||||||||| ||Fuel-loading|Y||||||||| ||Green belt(T14)|Y||||1270.01(o)||||| ||Greenways (T14)|Y||||1270.01(p)||||| ||Hammerhead/T (T14)|Y||||1270.01(q)||||| ||Hazardous land use
    (T14)_|Y||||1270.01(r)||||| ||Hazardous materials|Y||||||||| ||Heavy timber
    construction|Y||||||||| ||Ignition-resistant
    building material|Y||||||||| ||Local responsibility
    area (LRA)|Y||702A|4902.1|||||| ||Log wall construction|Y|||||||||

    2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE APPENDIX H-25

  • CPC § 1.11. Medium relevance — show source text

    Way_||||||X|X|||||||||||||||||| |Waiting Room|||X|||||||||||||||||||||| |Walk||||||X|X|||||||||||||||||| |Waterline||||||||||||||||||X||||||| |Wet Bar|||||||X|||||||||||||||||| |Wheelchair||||||X|X|||||||||||||||||| |Wheelchair Space|||||||X|||||||||||||||||| |Winery Caves|||X|||||||||||||||||||||| |Work Area Equipment|||||||X|||||||||||||||||| |Workstation_ (2nd paragraph_
    only)|||||||X||||||||||||||||||

    The state agency does not adopt sections identified by the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.

    2-10 2025 CALIFORNIA BUILDING CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    2 DEFINITIONS

    User notes:

    About this chapter: Codes, by their very nature, are technical documents. Every word, term and punctuation mark can add to or change the meaning of a technical requirement. It is necessary to maintain a consensus on the specific meaning of each term contained in the code. Chapter 2 performs this function by stating clearly what specific terms mean for the purposes of the code.

    ICC code development note: Code change proposals to sections preceded by the designation [A], [BG] or [BS] will be considered by one of the code development committees meeting during the 2025 (Group B) Code Development Cycle.

    SECTION 201—GENERAL

    201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code, have the meanings shown in this chapter.

    201.2 Interchangeability. Words used in the present tense include the future; words stated in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular.

    201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the California Energy Code, Califor- nia Existing Building Code, California Fire Code, California Green Building Standards Code, California Electrical Code, California Mechanical Code or California Plumbing Code, such terms shall have the meanings ascribed to them as in those codes.

    201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies.

    For applications listed in Section 1.11 regulated by the Office of the State Fire Marshal, where terms are not defined through the meth- ods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies. Webster’s Third New International Dictionary of the English Language, Unabridged, shall be considered as providing ordinarily accepted meanings.

    SECTION 202—DEFINITIONS

    [BG] 24-HOUR BASIS. The actual time that a person is an occupant within a facility for the purpose of receiving care. It shall not include a facility that is open for 24 hours and is capable of providing care to someone visiting the facility during any segment of the 24 hours.

    [BS] AAC MASONRY. Masonry made of autoclaved aerated concrete (AAC) units, manufactured without internal reinforcement and bonded together using thin- or thick-bed mortar.

  • CPC § 203.7.3 Medium relevance — show source text


    Title 19, Division 1]||||X|||||||||||||||||||| |Chapter / Section|||||||||||||||||||||||| |203.7.3|||X||||||||||||||||||||| |203.7.3.6 - 203.7.3.8|||X||||||||||||||||||||| |203.7.4|||X||||||||||||||||||||| |203.7.4.1|||X||||||||||||||||||||| |203.9.1|||X||||||||||||||||||||| |203.9.2|||X||||||||||||||||||||| |203.9.2.1|||X||||||||||||||||||||| |203.9.2.2|||X||||||||||||||||||||| |203.9.3|||X||||||||||||||||||||| |203.9.3.3|||X||||||||||||||||||||| |203.9.4|||X||||||||||||||||||||| |203.12|||X||||||||||||||||||||| |203.13|||X|||||||||||||||||||||

    • The California Code of Regulations (CCR), Title 19, Division 1 provisions that are found in the California Fire Code are a reprint from the current CCR, Title 19, Division 1 text for the code user’s convenience only. The scope, applicability and appeals procedures of CCR, Title 19, Division I remain the same. The state agency does not adopt sections identified by the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.

    2-4 2025 CALIFORNIA FIRE CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    2 DEFINITIONS

    User notes:

    About this chapter: Codes, by their very nature, are technical documents. Every word, term and punctuation mark can add to or change the meaning of a technical requirement. It is necessary to maintain a consensus on the specific meaning of each term contained in the code. Chapter 2 performs this function by stating clearly what specific terms mean for the purpose of the code. General definitions are located in Section 202 and occupancy classification definitions are located in Section 203.

    SECTION 201—GENERAL

    201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code, have the meanings shown in this chapter.

    201.2 Interchangeability. Words used in the present tense include the future; words stated in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular.

    201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the California Building Code, Cali- fornia Mechanical Code or California Plumbing Code, such terms shall have the meanings ascribed to them as in those codes.

    201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies. Merriam Webster’s Collegiate Dictionary, 11th Edition, shall be considered as providing ordinarily accepted meanings.

    SECTION 202—GENERAL DEFINITIONS

  • CPC § 17.4 Medium relevance — show source text

    8|17.4|1.5|2.5|3.4|5.1|0.6|1.0|1.3|1.9| |10|7.7|13.1|17.8|26.3|2.3|3.8|5.2|7.7|0.8|1.4|2.0|2.9| |12|10.8|18.4|24.9|NP|3.2|5.4|7.3|10.7|1.2|2.0|2.7|4.0| |14|14.4|24.5|NP|NP|4.2|7.1|9.6|14.3|1.6|2.7|3.6|5.4| |16|18.4|NP|NP|NP|5.4|9.1|12.4|18.3|2.0|3.4|4.7|6.9| |18|22.9|NP|NP|NP|6.7|11.4|15.4|22.7|2.5|4.3|5.8|8.6| |20|27.8|NP|NP|NP|8.1|13.8|18.7|27.6|3.1|5.2|7.0|10.4| |22|NP|NP|NP|NP|9.7|16.5|22.3|NP|3.7|6.2|8.4|12.4| |24|NP|NP|NP|NP|11.4|19.3|26.2|NP|4.3|7.3|9.9|14.6| |26|NP|NP|NP|NP|13.2|22.4|NP|NP|5.0|8.5|11.4|16.9| |28|NP|NP|NP|NP|15.1|25.7|NP|NP|5.7|9.7|13.1|19.4| |30|NP|NP|NP|NP|17.2|NP|NP|NP|6.5|11.0|14.9|22.0| |32|NP|NP|NP|NP|19.4|NP|NP|NP|7.3|12.4|16.8|24.8| |34|NP|NP|NP|NP|21.7|NP|NP|NP|8.2|13.9|18.8|NP| |36|NP|NP|NP|NP|24.1|NP|NP|NP|9.1|15.4|20.9|NP| |For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 0.063 L/s, 1 pound per square inch = 6.895 kPa.
    NP = Not Permitted. Pressure loss exceeds reasonable limits.
    a. Values are applicable for underground piping materials listed in_ the California Plumbing Code_ and are based on an SDR of 11 and a Hazen Williams C Factor of 150.
    b. Values include the following length allowances for fittings: 25-percent length increase for actual lengths up to 100 feet and 15-percent length increase for actual lengths over
    100 feet.
    c. Flow rate from Section P2904.4.2.

  • CPC § 304.8 Medium relevance — show source text


    1500|1100
    1200
    1300
    1400
    1500|40
    38
    37
    35
    34|83
    79
    76
    73
    70|169
    161
    154
    148
    143|295
    281
    269
    259
    249|418
    399
    382
    367
    353|893
    852
    816
    784
    755|1610
    1530
    1470
    1410
    1360|2530
    2420
    2320
    2220
    2140|5280
    5040
    4820
    4630
    4460| |1600
    1700
    1800
    1900
    2000|1600
    1700
    1800
    1900
    2000|33
    32
    31
    30
    29|68
    65
    63
    62
    60|138
    133
    129
    125
    122|241
    233
    226
    219
    213|341
    330
    320
    311
    302|729
    705
    684
    664
    646|1310
    1270
    1230
    1200
    1160|2070
    2000
    1940
    1890
    1830|4310
    4170
    4040
    3930
    3820|

    For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m [3] /h, 1 pound-force per square inch = 6.8947 kPa

  • CPC § 2-1 Medium relevance — show source text

    CHAPTER 2 – DEFINITIONS

    (Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

    Adopting agency BSC BSC-
    CG    		 SFM HCD Col6 Col7 DSA Col9 OSHPD Col11 Col12 Col13 Col14 Col15 BSCC DPH AGR DWR CEC CA SL SLC
    Adopting agency BSC BSC-
    CG    		 SFM 1 2 1/AC AC SS 1 1R 2 3 4 5 5 5 5 5 5 5 5 5
    Adopt entire CA chapter X X X
    Adopt entire chapter as
    amended (amended sections
    listed below)    		 X X X
    Adopt only those sections
    that are listed below
    Chapter/Section
    201
    CALIFORNIA RESIDENTIAL
    CODE    		 † † †
    LOW-RISE
    RESIDENTIAL BUILDING    		 † † †
    PLANTS † † †
    RESIDENTIAL BUILDING † † †
    RESILIENT FLOORING † † †

    The state agency does not adopt sections identified by the following symbol: †.

    2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 2-1

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    2-2 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    2 DEFINITIONS

    SECTION 201—GENERAL

    201.1 Scope. Unless otherwise stated, the following words and terms shall, for the purposes of this code, have the meanings shown in this chapter.

    201.2 Interchangeability. Words used in the present tense include the future; words stated in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular.

    201.3 Terms defined in other documents. Where terms are not defined in this code and are defined in the California Building Stan- dards Code or other referenced documents, such terms shall have the meanings ascribed to them as in those publications.

    201.4 Terms not defined. Where terms are not defined as specified in this section, such terms shall have ordinarily accepted meanings such as the context implies.

    SECTION 202—DEFINITIONS

Frequently asked questions

When exactly do I stop searching CPC Chapter 2 and look to other codes?

If the exact term is not present in CPC Chapter 2, stop there — the California practice is then to adopt the definition from the applicable California code that does define the term (see cross‑reference rule reproduced in the CA codes).

What if the other California code’s definition conflicts with a specific CPC provision?

Apply the CPC specific provision first and the order‑of‑precedence rule in Chapter 1 — if a conflict remains between different parts of Title 24, the more restrictive requirement normally prevails.

Are industry standards (ASTM, UPC) acceptable definitions?

Only when those standards are adopted by reference in CPC or when CPC Chapter 1/Referenced Standards makes them part of the enforceable requirements. Otherwise, prefer definitions in Chapter 2 or the other California codes.

Do agency adoptions ever override the “other code” definition?

Yes — specialized agencies (DSA, OSHPD, HCD, etc.) can and do have controlling definitional rules for their jurisdictions; the Existing Building Code and other codes call out those agency exceptions. Always confirm agency‑specific guidance.

Where do I find the fixture counts once a term is defined?

After deciding the occupancy/term meaning, use the CPC fixture tables (for example, Table 422.1) and any local amendments to compute fixture counts.

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